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IDL Problem Code 111 with alias logical-or

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Warning Problem

This is a "problem" that gets reported to let users know how that behavior might not match what they expect.

When IDL's compile options are set to idl2, idl3, or logical_predicate, it changes the way that logical operations are handled.

This warning let's you know that you should use || instead of or with logical comparisons in if, case, or switch statements.

idl
compile_opt idl2

if a or b then print, 'True!
   ; ^^ warning appears here

To correct, use || instead

idl
compile_opt idl2

if a || b then print, 'True!
   ; ^^ no warning

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